diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index 78fd9bed5d..48c15e9117 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -50,7 +50,6 @@ enum {
   TASK_STATUS__RECOVER_PREPARE,
   TASK_STATUS__RECOVER1,
   TASK_STATUS__RECOVER2,
-  TASK_STATUS__RESTORE,  // only available for source task to replay WAL from the checkpoint
 };
 
 enum {
@@ -346,7 +345,7 @@ typedef struct SStreamMeta {
   FTaskExpand* expandFunc;
   int32_t      vgId;
   SRWLatch     lock;
-  int32_t      walScan;
+  int32_t      walScanCounter;
 } SStreamMeta;
 
 int32_t tEncodeStreamEpInfo(SEncoder* pEncoder, const SStreamChildEpInfo* pInfo);
@@ -545,8 +544,9 @@ int32_t streamScanExec(SStreamTask* pTask, int32_t batchSz);
 // recover and fill history
 int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version);
 int32_t streamTaskLaunchRecover(SStreamTask* pTask, int64_t version);
-int32_t streamProcessTaskCheckReq(SStreamTask* pTask, const SStreamTaskCheckReq* pReq);
+int32_t streamTaskCheckStatus(SStreamTask* pTask);
 int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp* pRsp, int64_t version);
+
 // common
 int32_t streamSetParamForRecover(SStreamTask* pTask);
 int32_t streamRestoreParam(SStreamTask* pTask);
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 36c35ab415..fed7a8cf74 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -111,8 +111,13 @@ STQ* tqOpen(const char* path, SVnode* pVnode) {
   pTq->pCheckInfo = taosHashInit(64, MurmurHash3_32, true, HASH_ENTRY_LOCK);
   taosHashSetFreeFp(pTq->pCheckInfo, (FDelete)tDeleteSTqCheckInfo);
 
-  tqInitialize(pTq);
-  return pTq;
+  int32_t code = tqInitialize(pTq);
+  if (code != TSDB_CODE_SUCCESS) {
+    tqClose(pTq);
+    return NULL;
+  } else {
+    return pTq;
+  }
 }
 
 int32_t tqInitialize(STQ* pTq) {
@@ -601,11 +606,7 @@ int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   pTask->chkInfo.currentVer = ver;
 
   // expand executor
-  if (pTask->fillHistory) {
-    pTask->status.taskStatus = TASK_STATUS__WAIT_DOWNSTREAM;
-  } else {
-    pTask->status.taskStatus = TASK_STATUS__RESTORE;
-  }
+  pTask->status.taskStatus = (pTask->fillHistory)? TASK_STATUS__WAIT_DOWNSTREAM:TASK_STATUS__NORMAL;
 
   if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
     pTask->pState = streamStateOpen(pTq->pStreamMeta->path, pTask, false, -1, -1);
@@ -664,6 +665,7 @@ int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask, int64_t ver) {
   }
 
   streamSetupTrigger(pTask);
+
   tqInfo("vgId:%d expand stream task, s-task:%s, checkpoint ver:%" PRId64 " child id:%d, level:%d", vgId, pTask->id.idStr,
          pTask->chkInfo.version, pTask->selfChildId, pTask->taskLevel);
 
@@ -693,8 +695,9 @@ int32_t tqProcessStreamTaskCheckReq(STQ* pTq, SRpcMsg* pMsg) {
   };
 
   SStreamTask* pTask = streamMetaAcquireTask(pTq->pStreamMeta, taskId);
+
   if (pTask) {
-    rsp.status = (atomic_load_8(&pTask->status.taskStatus) == TASK_STATUS__NORMAL) ? 1 : 0;
+    rsp.status = streamTaskCheckStatus(pTask);
     streamMetaReleaseTask(pTq->pStreamMeta, pTask);
 
     tqDebug("tq recv task check req(reqId:0x%" PRIx64
@@ -1147,9 +1150,6 @@ int32_t tqProcessTaskRunReq(STQ* pTq, SRpcMsg* pMsg) {
   SStreamTask* pTask = streamMetaAcquireTask(pTq->pStreamMeta, taskId);
   if (pTask != NULL) {
     if (pTask->status.taskStatus == TASK_STATUS__NORMAL) {
-      tqDebug("vgId:%d s-task:%s start to process run req", vgId, pTask->id.idStr);
-      streamProcessRunReq(pTask);
-    } else if (pTask->status.taskStatus == TASK_STATUS__RESTORE) {
       tqDebug("vgId:%d s-task:%s start to process block from wal, last chk point:%" PRId64, vgId,
               pTask->id.idStr, pTask->chkInfo.version);
       streamProcessRunReq(pTask);
@@ -1313,10 +1313,10 @@ int32_t tqStartStreamTasks(STQ* pTq) {
     return 0;
   }
 
-  pMeta->walScan += 1;
+  pMeta->walScanCounter += 1;
 
-  if (pMeta->walScan > 1) {
-    tqDebug("vgId:%d wal read task has been launched, remain scan times:%d", vgId, pMeta->walScan);
+  if (pMeta->walScanCounter > 1) {
+    tqDebug("vgId:%d wal read task has been launched, remain scan times:%d", vgId, pMeta->walScanCounter);
     taosWUnLockLatch(&pTq->pStreamMeta->lock);
     return 0;
   }
diff --git a/source/dnode/vnode/src/tq/tqRestore.c b/source/dnode/vnode/src/tq/tqRestore.c
index 22903b95d9..6c8fce5b14 100644
--- a/source/dnode/vnode/src/tq/tqRestore.c
+++ b/source/dnode/vnode/src/tq/tqRestore.c
@@ -18,15 +18,14 @@
 static int32_t createStreamRunReq(SStreamMeta* pStreamMeta, bool* pScanIdle);
 
 // this function should be executed by stream threads.
-// there is a case that the WAL increases more fast than the restore procedure, and this restore procedure
-// will not stop eventually.
+// extract submit block from WAL, and add them into the input queue for the sources tasks.
 int32_t tqStreamTasksScanWal(STQ* pTq) {
   int32_t vgId = TD_VID(pTq->pVnode);
   SStreamMeta* pMeta = pTq->pStreamMeta;
   int64_t st = taosGetTimestampMs();
 
   while (1) {
-    int32_t scan = pMeta->walScan;
+    int32_t scan = pMeta->walScanCounter;
     tqDebug("vgId:%d continue check if data in wal are available, scan:%d", vgId, scan);
 
     // check all restore tasks
@@ -37,12 +36,12 @@ int32_t tqStreamTasksScanWal(STQ* pTq) {
 
     if (shouldIdle) {
       taosWLockLatch(&pMeta->lock);
-      pMeta->walScan -= 1;
-      times = pMeta->walScan;
+      pMeta->walScanCounter -= 1;
+      times = pMeta->walScanCounter;
 
-      ASSERT(pMeta->walScan >= 0);
+      ASSERT(pMeta->walScanCounter >= 0);
 
-      if (pMeta->walScan <= 0) {
+      if (pMeta->walScanCounter <= 0) {
         taosWUnLockLatch(&pMeta->lock);
         break;
       }
diff --git a/source/libs/stream/inc/streamInc.h b/source/libs/stream/inc/streamInc.h
index 876b80697a..b17afeec98 100644
--- a/source/libs/stream/inc/streamInc.h
+++ b/source/libs/stream/inc/streamInc.h
@@ -39,7 +39,7 @@ int32_t streamBroadcastToChildren(SStreamTask* pTask, const SSDataBlock* pBlock)
 
 int32_t tEncodeStreamRetrieveReq(SEncoder* pEncoder, const SStreamRetrieveReq* pReq);
 
-int32_t streamDispatchOneCheckReq(SStreamTask* pTask, const SStreamTaskCheckReq* pReq, int32_t nodeId, SEpSet* pEpSet);
+int32_t streamDispatchCheckMsg(SStreamTask* pTask, const SStreamTaskCheckReq* pReq, int32_t nodeId, SEpSet* pEpSet);
 
 int32_t streamDispatchOneRecoverFinishReq(SStreamTask* pTask, const SStreamRecoverFinishReq* pReq, int32_t vgId,
                                           SEpSet* pEpSet);
diff --git a/source/libs/stream/src/streamDispatch.c b/source/libs/stream/src/streamDispatch.c
index 549374ed94..d12eca7ce3 100644
--- a/source/libs/stream/src/streamDispatch.c
+++ b/source/libs/stream/src/streamDispatch.c
@@ -208,7 +208,7 @@ static int32_t streamAddBlockToDispatchMsg(const SSDataBlock* pBlock, SStreamDis
   return 0;
 }
 
-int32_t streamDispatchOneCheckReq(SStreamTask* pTask, const SStreamTaskCheckReq* pReq, int32_t nodeId, SEpSet* pEpSet) {
+int32_t streamDispatchCheckMsg(SStreamTask* pTask, const SStreamTaskCheckReq* pReq, int32_t nodeId, SEpSet* pEpSet) {
   void*   buf = NULL;
   int32_t code = -1;
   SRpcMsg msg = {0};
@@ -240,7 +240,7 @@ int32_t streamDispatchOneCheckReq(SStreamTask* pTask, const SStreamTaskCheckReq*
   msg.pCont = buf;
   msg.msgType = TDMT_STREAM_TASK_CHECK;
 
-  qDebug("dispatch from s-task:%s to downstream s-task:%" PRIx64 ":%d node %d: check msg", pTask->id.idStr,
+  qDebug("s-task:%s dispatch check msg to downstream s-task:%" PRIx64 ":%d node %d: check msg", pTask->id.idStr,
          pReq->streamId, pReq->downstreamTaskId, nodeId);
 
   tmsgSendReq(pEpSet, &msg);
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index e711700ef2..f33e126068 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -28,7 +28,7 @@ static int32_t streamTaskExecImpl(SStreamTask* pTask, const void* data, SArray*
 
   while (pTask->taskLevel == TASK_LEVEL__SOURCE) {
     int8_t status = atomic_load_8(&pTask->status.taskStatus);
-    if (status != TASK_STATUS__NORMAL && status != TASK_STATUS__RESTORE) {
+    if (status != TASK_STATUS__NORMAL) {
       qError("stream task wait for the end of fill history, s-task:%s, status:%d", pTask->id.idStr,
              atomic_load_8(&pTask->status.taskStatus));
       taosMsleep(2);
diff --git a/source/libs/stream/src/streamMeta.c b/source/libs/stream/src/streamMeta.c
index 065e9d280f..822ae2a485 100644
--- a/source/libs/stream/src/streamMeta.c
+++ b/source/libs/stream/src/streamMeta.c
@@ -287,6 +287,7 @@ int32_t streamLoadTasks(SStreamMeta* pMeta, int64_t ver) {
       tdbTbcClose(pCur);
       return -1;
     }
+
     tDecoderInit(&decoder, (uint8_t*)pVal, vLen);
     tDecodeStreamTask(&decoder, pTask);
     tDecoderClear(&decoder);
@@ -305,7 +306,6 @@ int32_t streamLoadTasks(SStreamMeta* pMeta, int64_t ver) {
       return -1;
     }
 
-    /*pTask->status.taskStatus = TASK_STATUS__NORMAL;*/
     if (pTask->fillHistory) {
       pTask->status.taskStatus = TASK_STATUS__WAIT_DOWNSTREAM;
       streamTaskCheckDownstream(pTask, ver);
diff --git a/source/libs/stream/src/streamRecover.c b/source/libs/stream/src/streamRecover.c
index 0d214661c4..67f3a95827 100644
--- a/source/libs/stream/src/streamRecover.c
+++ b/source/libs/stream/src/streamRecover.c
@@ -54,6 +54,8 @@ int32_t streamTaskLaunchRecover(SStreamTask* pTask, int64_t version) {
 
 // checkstatus
 int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version) {
+  qDebug("s-taks:%s in fill history stage, ver:%"PRId64, pTask->id.idStr, version);
+
   SStreamTaskCheckReq req = {
       .streamId = pTask->id.streamId,
       .upstreamTaskId = pTask->id.taskId,
@@ -63,6 +65,7 @@ int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version) {
 
   // serialize
   if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH) {
+
     req.reqId = tGenIdPI64();
     req.downstreamNodeId = pTask->fixedEpDispatcher.nodeId;
     req.downstreamTaskId = pTask->fixedEpDispatcher.taskId;
@@ -70,7 +73,7 @@ int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version) {
 
     qDebug("s-task:%s at node %d check downstream task %d at node %d", pTask->id.idStr, pTask->nodeId, req.downstreamTaskId,
            req.downstreamNodeId);
-    streamDispatchOneCheckReq(pTask, &req, pTask->fixedEpDispatcher.nodeId, &pTask->fixedEpDispatcher.epSet);
+    streamDispatchCheckMsg(pTask, &req, pTask->fixedEpDispatcher.nodeId, &pTask->fixedEpDispatcher.epSet);
   } else if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
     SArray* vgInfo = pTask->shuffleDispatcher.dbInfo.pVgroupInfos;
 
@@ -86,7 +89,7 @@ int32_t streamTaskCheckDownstream(SStreamTask* pTask, int64_t version) {
       req.downstreamTaskId = pVgInfo->taskId;
       qDebug("s-task:%s at node %d check downstream task %d at node %d (shuffle)", pTask->id.idStr, pTask->nodeId,
              req.downstreamTaskId, req.downstreamNodeId);
-      streamDispatchOneCheckReq(pTask, &req, pVgInfo->vgId, &pVgInfo->epSet);
+      streamDispatchCheckMsg(pTask, &req, pVgInfo->vgId, &pVgInfo->epSet);
     }
   } else {
     qDebug("s-task:%s at node %d direct launch recover since no downstream", pTask->id.idStr, pTask->nodeId);
@@ -111,14 +114,14 @@ int32_t streamRecheckOneDownstream(SStreamTask* pTask, const SStreamTaskCheckRsp
          req.downstreamTaskId, req.downstreamNodeId);
 
   if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH) {
-    streamDispatchOneCheckReq(pTask, &req, pRsp->downstreamNodeId, &pTask->fixedEpDispatcher.epSet);
+    streamDispatchCheckMsg(pTask, &req, pRsp->downstreamNodeId, &pTask->fixedEpDispatcher.epSet);
   } else if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
     SArray* vgInfo = pTask->shuffleDispatcher.dbInfo.pVgroupInfos;
     int32_t vgSz = taosArrayGetSize(vgInfo);
     for (int32_t i = 0; i < vgSz; i++) {
       SVgroupInfo* pVgInfo = taosArrayGet(vgInfo, i);
       if (pVgInfo->taskId == req.downstreamTaskId) {
-        streamDispatchOneCheckReq(pTask, &req, pRsp->downstreamNodeId, &pVgInfo->epSet);
+        streamDispatchCheckMsg(pTask, &req, pRsp->downstreamNodeId, &pVgInfo->epSet);
       }
     }
   }
@@ -126,8 +129,8 @@ int32_t streamRecheckOneDownstream(SStreamTask* pTask, const SStreamTaskCheckRsp
   return 0;
 }
 
-int32_t streamProcessTaskCheckReq(SStreamTask* pTask, const SStreamTaskCheckReq* pReq) {
-  return atomic_load_8(&pTask->status.taskStatus) == TASK_STATUS__NORMAL;
+int32_t streamTaskCheckStatus(SStreamTask* pTask) {
+  return atomic_load_8(&pTask->status.taskStatus) == TASK_STATUS__NORMAL? 1:0;
 }
 
 int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp* pRsp, int64_t version) {
@@ -137,7 +140,9 @@ int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp*
   if (pRsp->status == 1) {
     if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
       bool found = false;
-      for (int32_t i = 0; i < taosArrayGetSize(pTask->checkReqIds); i++) {
+
+      int32_t numOfReqs = taosArrayGetSize(pTask->checkReqIds);
+      for (int32_t i = 0; i < numOfReqs; i++) {
         int64_t reqId = *(int64_t*)taosArrayGet(pTask->checkReqIds, i);
         if (reqId == pRsp->reqId) {
           found = true;
@@ -151,9 +156,12 @@ int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp*
 
       int32_t left = atomic_sub_fetch_32(&pTask->recoverTryingDownstream, 1);
       ASSERT(left >= 0);
+
       if (left == 0) {
         taosArrayDestroy(pTask->checkReqIds);
         pTask->checkReqIds = NULL;
+
+        qDebug("s-task:%s all downstream tasks:%d are ready, now enter into recover stage", pTask->id.idStr, numOfReqs);
         streamTaskLaunchRecover(pTask, version);
       }
     } else if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH) {
@@ -165,7 +173,10 @@ int32_t streamProcessTaskCheckRsp(SStreamTask* pTask, const SStreamTaskCheckRsp*
     } else {
       ASSERT(0);
     }
-  } else { // not ready, it should wait for at least 100ms and then retry
+  } else { // not ready, wait for 100ms and retry
+    qDebug("s-task:%s downstream taskId:%"PRId64" (vgId:%d) not ready, wait for 100ms and retry", pTask->id.idStr,
+        pRsp->downstreamTaskId, pRsp->downstreamNodeId);
+    taosMsleep(100);
     streamRecheckOneDownstream(pTask, pRsp);
   }